build: define base filenames for use elsewhere in the buildsystem

Unfortunately, the target namees defined at the Makefile.am level can't be used
for *.in substitution. So these new defines will have to stay synced up with
those targets.

Using the new variables for the deploy targets in the main Makefile.am will
ensure that they stay in sync, otherwise build tests will fail.

Makefile.am

@@ -10,9 +10,9 @@ pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = libbitcoinconsensus.pc
 endif
 
-BITCOIND_BIN=$(top_builddir)/src/bitcoind$(EXEEXT)
-BITCOIN_QT_BIN=$(top_builddir)/src/qt/bitcoin-qt$(EXEEXT)
-BITCOIN_CLI_BIN=$(top_builddir)/src/bitcoin-cli$(EXEEXT)
+BITCOIND_BIN=$(top_builddir)/src/$(BITCOIN_DAEMON_NAME)$(EXEEXT)
+BITCOIN_QT_BIN=$(top_builddir)/src/qt/$(BITCOIN_GUI_NAME)$(EXEEXT)
+BITCOIN_CLI_BIN=$(top_builddir)/src/$(BITCOIN_CLI_NAME)$(EXEEXT)
 BITCOIN_WIN_INSTALLER=$(PACKAGE)-$(PACKAGE_VERSION)-win$(WINDOWS_BITS)-setup$(EXEEXT)
 
 empty :=

configure.ac

@@ -14,6 +14,11 @@ AC_CONFIG_HEADERS([src/config/bitcoin-config.h])
 AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_MACRO_DIR([build-aux/m4])
 
+BITCOIN_DAEMON_NAME=bitcoind
+BITCOIN_GUI_NAME=bitcoin-qt
+BITCOIN_CLI_NAME=bitcoin-cli
+BITCOIN_TX_NAME=bitcoin-tx
+
 AC_CANONICAL_HOST
 
 AH_TOP([#ifndef BITCOIN_CONFIG_H])
@@ -1019,6 +1024,10 @@ AC_SUBST(COPYRIGHT_YEAR, _COPYRIGHT_YEAR)
 AC_SUBST(COPYRIGHT_HOLDERS, "_COPYRIGHT_HOLDERS")
 AC_SUBST(COPYRIGHT_HOLDERS_SUBSTITUTION, "_COPYRIGHT_HOLDERS_SUBSTITUTION")
 AC_SUBST(COPYRIGHT_HOLDERS_FINAL, "_COPYRIGHT_HOLDERS_FINAL")
+AC_SUBST(BITCOIN_DAEMON_NAME)
+AC_SUBST(BITCOIN_GUI_NAME)
+AC_SUBST(BITCOIN_CLI_NAME)
+AC_SUBST(BITCOIN_TX_NAME)
 
 AC_SUBST(RELDFLAGS)
 AC_SUBST(HARDENED_CXXFLAGS)